Patent US2459935A successfully refreshed from Google Patents.
US2459935A
Expired / Lapsed
US
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Jet propulsion plant
Assignee: De Havilland Aircraft Co Ltd
•
Filing: 1943-07-20
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Granted: 1949-01-25
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Expires: 1963-07-20
Abstract
No abstract record available.
Inventors
- 👤 Halford Frank Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:11
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-25 | 1952-07-26 | 1953-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-25 | 1956-07-26 | 1957-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-25 | 1960-07-26 | 1961-01-25 | $7700.00 | Window Closed / Lapsed |